As far as I remember as soon as the event ends you get the rewards correct?
But I am pretty sure that I just opened it and .... no rewards at all.
Am I just imagining things or is the reward given later?
This is going to sound dumb, but you also might have forgotten to do it.
I play on 3 accounts, and got rewards on 2 of them.
After sitting around wondering what the hell happened, I realized I forgot to do it.
Labyrinth is horrible. I don't think it's surprising at all that I forgot to do it.